The security validation for this page has timed out

The security validation for this page has timed out. Click Back in your Web browser, refresh the page, and try your operation again.

Description:

An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: Microsoft.SharePoint.WebPartPages.WebPartPageUserException: The security validation for this page has timed out. Click Back in your Web browser, refresh the page, and try your operation again.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

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